| Quantr Limited | Private company limited by shares | Live |
| QUANTRACT LIMITED | Private company limited by shares | Live |
| QuantRaiser Limited | | Live |
| QUANTRAN SYSTEMS LIMITED | Private company limited by shares | Live |
| QuantRatio Limited | Private company limited by shares | Live |
| QuantRes Finance Limited | Private company limited by shares | Live |
| QUANTREUM RESOURCES LIMITED | Private company limited by shares | Live |
| QUANTREX CAPITAL LIMITED | Private company limited by shares | Live |
| QUANTRIX LIMITED | Private company limited by shares | Dissolved |
| QUANTRO INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUANTRONICS AUDIO LIMITED | Private company limited by shares | Dissolved |
| QUANTRONICS MANUFACTURING (H.K.)LIMITED | Private company limited by shares | Dissolved |
| QUANTRONICS PHOTOGRAPHIC LIMITED | Private company limited by shares | Dissolved |
| QUANTRONICS TELECOMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |